Valve-operating mechanism.



W. F. VAN HOESEN. VALVE OPERATING MECHANISM. APPLICATION FILED NOV. 12, 1914 Ligfi fiQfi Patented Mar. 30. 1915.

Witnessz: Inventor:

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. in open position WULLMLM F. VAN HO'ESETN, 0F SUITE N391 ABBY, NEW YURK, ASSIGNQR T0 ELECTRIC GOMPAI ii, CGEPQ'EATIQZT 0 NEVT YORK.

VALVE-QTEIRATXNG MECHANISM.

(Boutinuation in part of application Serial lilo. 851,564,

specification of Letters Eatcnt.

filed .nn r2, 1914. This application filed. November 1%, 1914;. Serial. No. 871,707-

To all 1072 om it may concern:

Be it known that l, "WILLIAM F. Van Houses, a citizen of the limited fitates, re siding at Schenectady, in the county of Schenectady, Statevof New York, have in vented certain new and. useful improvements in White-Operating lrlechanisms, of which the following is a specification.

This application is a continuation in part of my application, Serial lilo. 851 5641, filed July 1.7, 191%.

The present invention relates to valve operating means for the valve mechanism 0 elastic fluid turbines, particularly of the not necessarily limited thereto.

When a steam turbine is operated continuously for a long time, as is frequently the case, the nozzle valves, particularly those to open first, may be held continuously during the entire time, and their stems are liable to become coated with mud and other impurities which Wit? cause them to stick and tend to PI'EfiYrT. V; s .snpt and complete seating of the valves, This is a dangerous condition of things, because with a condensing turbine it requires only a small amount of steam to cause the machine to run away when the load is removed, as for instance, by the opening of the circuit breaker in the main leads.

At such times it is absolutely essential that the valves should close quickly and tightly so that not a pound of steam can reach the turbine. For this reason it is desirable to provide in addition to, or in lieu of, the usual springs used to bias the valves to closed position, a positive means for closing the same which will be powerful enough to overcome any sticking of the valve or valves due to the collection of mud or sediment, or to other reasons.

The object of the present invention is to provide an improved arrangement for positively actuating a valve or valves, as the nozzle valve or valves of an elastic fiuidturt having a series, of nozzle valves whic ai successively opened and closed as the v load increases and decreases, although it is bins, in the closing, as well. as in the opening movement.

For a consideration of what I believe to be novel and my invention, attention is directed to the following description and the claims appended thereto.

In the accompanying drawing, Figure l is -of threaded bolts-9A in a sectional elevation of a turbine valve mechanism embodying myunvention; Fig. 2 1s a fragmentary view of the nozzle valve Patentedlltar, so, iera mechanism of an elastic fluid turbine; Fig.

3 isa top plan view of a valve operating mechanism; i is an enlarged view of a detail: and Fig. 5 is a section taken on line 55, Fig. 1.

Referring to the drawing, 6 indicates the steam chest of an elastic fluid turbine in which are arranged the usual nozzle valves '2'. Each valve comprises a. valve head 8 which seats on a valve seat 9, and a stem 10. The upper end of the stem is reduced in diameter to form a shoulder 11 against which rests a collar 12. Supported on the collar is a spacing sleeve 13 upon which rests a head ll. These parts are held in position on the stem by a nut 15 threaded on the end of the stem or by other suitable 16 is a closing spring supported in a suitable bracket 17. The spring presses against the head 1% to bias the valve to closed position. The valves are successively lifted against the springs by suitable levers raised by cams. In the present instance each lever is shown as comprising two arms 18 pivoted at 19 to the adjacent bracket 17. These arms project one on each side of the valve stem between the head 14: and the collar 12, and have their ends joined by a pin 20 CHI. rying an QIltl'TIlCtlOH roller 21. On the inner surface of each arm adjacent the stem is a shoulder or projection 22 adapted to engage with the collar 12. The arms have. pins 23 set in them which act against the heads the valve, and the projections 22 may engage collar 12 to positively close the valve.

25 indicates a cam shaft oscillated through a rack and pinion 26 by means of a suits able mechanism controlled by the speed governor as is well known. On this cam shaft are a series of; cams 27 which engage the rollers 21. Each cam has an active face 28 to lift its lever arms and open the corresponding valve and a holding-"face Zu concentric with the cam shaft to maintain the. valve in its open position during further an ular movement of the shaft. The active fades of the cams are angularly disposed head it in opening around the cam.-:;g haft so as'jto. successively positively actuate theirlevers 1n closing as wbeing supplemental to the usual closin well as in opening the valves. .It may be appl ed to each cam or only to some of them, and in one aspect 1t may be considered as springs, acting to positively start the valve or force it t'o-its seat in case-the closing spring is insuihcient. It formsin substance, however, almeans for positively insuring the closing of the valve to which it is applied 'when the valve isreleased {,permit it to close.

comprises apin both sides of the just above the hooks by the cam to In the present embodiment my invention projecting laterally from In and ahook 331 on each "lever cooperating with y en the cam 'raises the ms the pin will pass to'ap'osi-tion n; essary, to force the lever arms down w on the cam turns. backward, causing the friction roller on the lever arms to ride down the active face of the cam and the valve to sea These operations are well shown in the drawing. In Fig. 1, the valve is; closed and the ,roller 17 .is resting on the hub of the cam. The dotted lines in Fig. 4 show the cam tun'ned forward'until its active fce is just about to lift the lever arms. Th pin has beeh carried past'the tip of the hooks,

which in the further notation of the cam will be thrust in under the pin and follow it upward 'ujntil the roller arrives at the-holding ace on the cam, as shown in full lines in Fig. it The cam can now rotate forward as far tbs may be necessary, carrying the pin with it, but upon its return to this position in full lines in Fig. 4,-the pin will be in o'sitid'n to engage the hooks. If now upon urthe'r backward. rotation of the cam, the spring fails to causethe valve to move toward its seat, and the'arms to move down ward ,keeping the roller upon the surface of at cam, then the pin will engage the I hooks and pull them downso as to compel the rot.

er to'follovv the contour of the cam and th. lever to drop thus positively moving th valve to closed position. 'At this point te roller will rest.once mo re on the A hub of the cam and the hooks" and the pin will pant company, by reason of the divergence of the intersecting circular paths in which. they move, sothat further'ba'ckward rotation of the cam is not prevented. g

It willbe noted that in the present embodiment of my invention there isa limited amount -ofplay in the connection between lves. The arrangement comprises a known con-- to which it may be adapted.

and thus be ready, if

the abutments' on the valve stem and the g ing the valve toward its seat as already described. It is to be understood, however, that my invention is not necessarily limited to this specific arrangement, nor to use only in connection with v the admission nozzle valve or valves of the turbine, as it may find application 'in connection with any valve 4 It is evident that the shape of the hooks and the location of the pin must be carefully worked out with reference to the cam in order to secure their engagement and. dis

engagement in the manner set forth. The device, is, however, extremely simple, and adds so little to the cost of a turbine that the expense'is practically negligible. Yet it positively removes the danger of sticking valve stems, in a manner which is entirely reliable, is continuously in operation, requires no adjustment, and needs very little attehtion.

In accordance with the provisions of the patent statutes, I have described the principle of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof, but I desire to have it understood that the apparatus shown is only illustrative and that the invention can be carried OlliMbY other means. I

mat I claim as new and desire to secure by Letters Patent of the United States is 1.-Valve mechanism for elastic fluid turbines comprising a plurality of valves biased to closed position, levers for operating the valves, cams for moving the levers to open the valves, and means carried by the cams for engaging the levers to positively close the valves in case any of them should remain open against the biasing force when the cams are moved to permit them to close.

2. Valve mechanism for'elastic fluid turbines, comprising-a lifting lever for the valve, a'cam for moving the lever to open the valve, and a means carried by the cam and normally inactive for engaging the lever and positively'moving it to seat the valve. I

3. Valve mechanism forelastic fluid turbines, comprising a valve, an operating lever therefor, a closing spring, a cam for moving the lever to open the valve against the Spring, a" valve closing device carried by the mamas I m lever, and a means carried by the cam with and, push down said hooks when the adapted to engage the valveclosing device'atj cams turn backward and continue their roa predetermined point in its travel and-cotation without further obstruction. operate with the spring to close the valve. 7 Ina valve mechanism for elastic" fluid 5 4:. Valve mechanism for elastic fluid turturbines, the combinationof a valve, a-hft- 0' bines, "comprising a lifting lever provided ing lever for the valve comprising two arms,

with a hook, and a cam for actuating said a cam for moving said arms .to open the lever having-a pin adapted toengage. with valve, a hook on each arm, and a projectsaid hook. I i ing pin on the cam for engaging the hooks. 10 5. Valve-mechanism for elastic fluid tur- 8. In avalve mechanism for elastic fluid '35 'bines comprising a camshaft, a plurality of turbines, the combination of a valve, an cams thereon, a-pin projecting laterally from operating lever therefor, means for biasingeach cam, a plurality of lifting levers, and a the valve to closed position, a cam for movhook on each lever, the circular path of ing thelever toopen the valve, and means 115 movement of the pins. intersecting that of carried by the cam, which engages the lever 40,

the hooks. Y to positively close the valve in case it should 6. Valve mechanism for elastic fluid turremain open against its biasing means when 'loines comprising a cam shaft, a plurality of the cam ismoved to permit it to close. cams'thereomapin projecting laterally from y In witness'whereof, I have hereunto set 20 each cam, a pluralityof;l lifting leversatrlid 2% my hand this 11th day November 1914. hook on each lever, t e circu ar pat o p movement of the pins intersecting that of WILLIAM VAN HOESEN' the hooks, and said pins being so located as. Witnesses: to passin advance of said hooks when the BENJAMIN B.' HULL,

25 cams are rotating forward,and to engage HELEN Onronn. 

